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Another important feature of a messaging system is that it can guarantee delivery of a message to the target application by persisting the message. The messaging system achieves this by trying again and again until the message is delivered (if it is unable to deliver the message to the intended target the first time). The messaging system may not be able to deliver the message in the first few tries for various reasons. For example, the server application may not be running or the network is down. Yet another important problem that asynchronous messaging solves relates to applications specifically designed to run disconnected from the network, yet synchronize with servers when a network connection is available. Examples include applications deployed on laptop computers and PDAs. Messaging fits in very well for enabling this synchronization. Data to be synchronized is queued as it is created, waiting until the applications connects to the server. The decoupling between the client and server application achieved through messaging also helps to avoid another serious problem that can occur with RPC and distributed objects. That problem is throttling, which refers to the fact that with RPC and distributed objects, a single server can be overloaded with requests from different clients. This can lead to performance degradation and even cause the server to crash. Because the messaging system queues up requests until the server is ready to process them, the server can control the rate at which it operates on the requests so as not to overload itself by too many simultaneous requests. The clients are unaffected by this throttling because communication is asynchronous, so the clients are not blocked from continuing their work. The three elements of a basic messaging system are
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Channels are used to transmit data, and each channel acts as a virtual pipe that connects a receiver with the sender. Channels do not come preconfigured in a newly installed messaging system; rather, you must determine how your applications need to communicate and then create the appropriate channels. There are two basic types of channels. The first is called the point-to-point channel, in which only one receiver can receive a given message. The second is called publish-and-subscribe. In this second type, any number of receivers can get and act on a message. We describe these two types of channels in detail later in this chapter.
Messaging
Messages encapsulate the data to be transmitted. A message consists of a header and a body. The information contained in the header is primarily for the messaging system to use. The header contains information regarding destination, origin, and more. The body contains the actual data the receiver consumes. The data contained in the body can be of different types. It can be a command message, which is used to invoke a procedure (method) in the receiving application, or it can be a document message, which is used to transfer data from one application to another. It can also be an event message, which is used to inform the receiving application of an event in the sending application. A messaging system acts like a server, and the application sending or receiving a message acts as a client of the messaging system. The messaging system usually supplies a client API for the client to interact with the messaging system. For example, IBM s WebSphere MQ supplies an API called MQI, which the applications can use to connect to the MQ messaging system and to send and receive messages. The API is not application specific. The client therefore must contain a set of code that uses this API to connect to the messaging system to exchange messages with other applications. This additional set of code is called a message end point, which the rest of the application uses to send or receive messages. A messaging end point can be used either to send or receive messages, but not both. JMS is a standard vendor-neutral API that can be used to access messaging systems. JMS is analogous to JDBC: Whereas JDBC is an API that can be used to access many databases; JMS provides the same vendor-independent access to messaging systems. Many enterprise messaging systems support JMS, including IBM s WebSphere MQ. Software applications that use the JMS API for sending or receiving messages are portable across JMS vendors. Java applications that use JMS are called JMS clients, and the messaging system that handles the routing and delivery of messages is called the JMS provider. A JMS client that sends a message is called a producer, whereas a JMS client that receives a message is called a consumer. A single JMS client can be both a producer and a consumer. In addition to IBM WebSphere MQ, other products in this category include WebMethods, TIBCO, SeeBeyond, Microsoft s BizTalk, and many others. Many application servers, such as the IBM WebSphere Application Server, also offer the basic capability to send and receive asynchronous messages. In many cases, this provides a cheaper alternative to a full-blown messaging system. However, if the number of applications to be integrated is large, as is usually the case in a large enterprise, application server asynchronous messaging capabilities are limited in scalability.
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